Perhaps you work in a company that needs a specialized device to do some of your work. For example, a fabric company may need a device that can register that the material is appropriately attached to the pins of a machine and can stop the machine if it comes apart. This is a common need. A PCB could be designed to use in a simple device to record this data and make decisions based on what it sees.
Additionally, you may want to sell a new product to the market to determine if you left your stove on. The basis for this device would inherently be logical decision making. Therefore, you’d need a circuit board upon which to attach the components. With a little help from a professional, you could design something that would take simple readings and make a decision as to whether or not that stove is on, and from there could transmit to your phone or another device. It’s extremely simple once you have a designed board at your disposal to help you and upon which to build a foundation.
On Your Own
Many people also like to tinker, so it’s no wonder there is a market for custom circuit boards for individual consumers. Many people will simply reach out and say they have a specific device they want to craft for their own house with no intention of selling a product. With a PCB in hand, they go about creating a useful device that is customized exactly how they want it, without any fuss or need to go and buy a cumbersome device. In this modern age of technology, people are using technology to create anything their heart desires, and PCBs allow them to do that.
Maybe you’re just a tinkerer, like many people out there. You’ve gone past the stage of using a breadboard and wires to design circuitry and want to put something together. Get a circuit board from a designer or from a retailer and start building. The beautiful thing is, the widespread availability of these devices allows everyone to begin using and customizing them as they see fit. There are very few boundaries. However, the knowledge base is one of the few hurdles to creating something truly practical that can make a real impact on society.